I've always assumed the law had a built in "Jesus clause" that pointed to the Messiah as the fulfiller of the law. Perhaps that is just the NT scriptures and not supported by the OT law itself.
Paul actually invented "Christianity".
You can't fulfill a law. It is a stupid idea.
The "logic" of the atonement defies imagination.
It wasn't Adam being replaced with Jesus we are dealing with.
It was man not following god's instructions: i.e. "sin".
Men did what was right ___IN THEIR OWN EYES__ and God had to deal with it.
The law offered a certain group of people the purportedly "actual description of behavior" which God was said to require to have a relationship with man without getting so pissed off he killed them.
What Jesus did---even by Paul's standard---was cheating.
Mankind still is in the exact same condition it always was.
All the rest is just words, assertions, interpretations.
Nobody I know has heard word one from the sky verifying any of it.
Hearsay and nothing more.